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CVE-2021-25666

Estado: ModificadaMedia (4.3)—

A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Siemens — Scalance W740 FirmwareSiemens — Scalance W780 Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-25666",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 3.3,
          "accessVector": "ADJACENT_NETWORK",
          "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.5,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
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        "impactScore": 1.4,
        "exploitabilityScore": 2.8
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  "affected": [
    {
      "source": "productcert@siemens.com",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SCALANCE W780 and W740 (IEEE 802.11n) family",
          "versions": [
            {
              "status": "affected",
              "version": "All versions < V6.3"
            }
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  "published": "2021-02-09T18:15:51.573",
  "references": [
    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "productcert@siemens.com"
    },
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-040-07",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "source": "productcert@siemens.com"
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    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-040-07",
      "tags": [
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        "VDB Entry"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "productcert@siemens.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time."
    },
    {
      "lang": "es",
      "value": "Se ha identificado una vulnerabilidad en la familia SCALANCE W780 y W740 (IEEE 802.11n) (todas las versiones anteriores a V6.3).&#xa0;El envío de paquetes especialmente diseñados por medio del protocolo ARP hacia un dispositivo afectado podría causar una denegación de servicio parcial, impidiendo al dispositivo funcionar normalmente durante un corto período de tiempo"
    }
  ],
  "lastModified": "2026-06-17T03:42:19.073",
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